Đáp án:
Giải thích các bước giải:
` 16/15 . (-5)/24 . 54/24 . 56/21 `
` = -2/9 . 54/24 . 56/21 `
` = -1/2 . 56/21 `
`=-4/3 `
` 7/3 . (-5)/2 . 15/21 . 4/(-5) `
` = -35/6 . 15/21 . 4/(-5) `
`=-25/6 . 4/(-5) `
`=10/3 `
` (-5/9) . 3/23 + ( - 13)/18 . 3/23 `
`=-5/69 + (-13)/138 `
`=-1/6 `
` 1/4 . (-2/13) - 7/24 . 2/13 `
` = -1/26 - 7/156 `
`=-1/12 `
` -2/3 . 3/11 + (-7)/9 . 3/11 - 3/11 `
` = -2/3 . 3/11 + (-7)/9 . 3/11 - 3/11 . 1 `
`= 3/11 . ( -2/3 + (-7)/9 + 1 ) `
`= 3/11 . -4/9 `
`=-4/33 `
` 7/13 . 5/19 + 7/19 . 8/13 - 3 . 7/19 `
` = 7/13 . 5/19 + 7/19 . ( 8/13 - 3 ) `
`= 7/13 . 5/19 + 7/19 . -31/13 `
` = 35/247 + (-217)/247 `
` = -14/19 `